Which term is described as the functions used in mathematical expressions and equations?

• A. Variables
• B. Operators
• C. Functions
• D. Operations

Answer: (D)

Operations are the actions performed on numbers or variables to produce a result, like adding, subtracting, multiplying, or dividing. In math, these actions can be thought of as functions that take inputs (the operands) and return an output. When we describe “the functions used in mathematical expressions and equations,” we’re referring to these processes—the operations that combine inputs to yield a result. Variables are placeholders for values, not the actions themselves; operators are the symbols that denote the action; functions are a broader concept that maps inputs to outputs, whereas the term here points to the actions themselves.